Does Wilson know the metric system?

I have 3 Wilson racquets and all 3 recommend a tension of 50-60lbs. However, they all have different recommended tension ranges when displaying them in kilos. My 6.0 85 says 25-29kg(which converts to approx. 55-64lbs), my 6.0 Triad says 23-27kg(50.7-59.5lbs) and my Tour 90 says 22-27kg(48.5-59.5lbs).
I wonder why all this is, and I wonder if new 6.0 Originals still recommend 25-29kg.

That's too ironic, looking at the quality control of some of Wilson's other frames. At any rate, perhaps with the 6.0 85, Wilson forgot to change the kg blurb as the recommended tension range decreased through the years. A 55-65 pounds recommendation was what Wilson used before settling at 50-60 pounds. Looks like they got it right with the 6.0 Triad. Then Wilson dropped the Tour 90 by 1kg. Maybe Wilson divided 50 pounds by a conversion rate to get a kg measurement, then truncated the result instead of estimating. Also, with the advent of poly-type strings and still a relatively small headsize, perhaps Wilson thought it wouldn't hurt to stick a slightly lower range on the Tour 90, especially when a kg measurement would be more likely to be used in Europe on clay, where tensions are usually lower than on hard court.